Nitrogen-doped Co/Co9S8/partly-graphitized carbon as durable catalysts for oxygen reduction in microbial fuel cells
Nitrogen-doped Co/Co9S8/partly-graphitized carbon as durable catalysts for oxygen reduction in microbial fuel cells
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氮掺杂Co/Co9S8/部分石墨化碳作为微生物燃料电池中氧还原的耐用催化剂
DOI：
10.1016/j.jpowsour.2015.12.115
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发表时间：
2016-03-01
影响因子：
9.2
通讯作者：
Fu, Honggang
中科院分区：
文献类型：
--
作者：
Li, Rui;Dai, Ying;Fu, Honggang
氧还原反应（ORR）催化剂的耐久性是影响微生物燃料电池（MFC）性能的关键因素。以钴（Co）螯合聚苯胺（PANI）为氮源和碳源，制备了N掺杂Co/Co 9 S8/部分石墨化碳（Co/Co 9 S8/NPGC）催化剂。通过调节加热温度（600-1000 ℃）来研究Co/Co 9 S8/NPGC的结构-活性相关性，以研究活性组分（Co/Co 9 S8）和N掺杂的官能团（N物质）如何影响ORR活性。随着温度的升高，源于Co 9 S8还原的Co逐渐结晶，形成Co/Co 9 S8异质结。以Co/Co 9 S8/NPGC（800 ℃）为阴极的MFC在运行75 d后获得了最高的功率密度（1156 mW m（-2））和最低的电荷转移电阻（11.1 Ω），优于商业Pt/C（10 wt.%）。虽然单独的Co 9 S8在ORR中起有限的作用，但是发现所得的Co/Co 9 S8对于在MFC阴极中实现高活性和耐久性是不可缺少的。Co/Co 9 S8/NPGC（800和900 ℃）的主要ORR途径是四电子O-2还原，这归因于吡啶态N、石墨态N和Co-N-x物种的共存。这些新的N掺杂金属硫化物/PGC复合材料显示出在MFC中应用的前景。(C)2015 Elsevier B. V.版权所有。
Durability of catalysts for oxygen reduction reaction (ORR) is the key factor for governing the performance of microbial fuel cells (MFCs). The cobalt (Co) chelated polyaniline (PANI) is used as the nitrogen and carbon sources to prepare the N-doped Co/Co9S8/partly-graphitized carbon (Co/Co9S8/NPGC) catalysts. Structure-activity correlations for Co/Co9S8/NPGC are explored by tuning the heating temperature (600-1000 degrees C) to investigate how the active components (Co/Co9S8) and N-doped functionalities (N species) influence the ORR activity. As temperature increases, the gradual crystallization of Co originating from the reduction of Co9S8 is conducted to form the Co/Co9S8 heterojunction. MFCs with Co/Co9S8/NPGC (800 degrees C) cathode obtain the highest power density (1156 mW m(-2)) and the lowest charge transfer resistance (11.1 Omega) after 75 d running, which are better than commercial Pt/C (10 wt.%). Although the sole Co9S8 plays a limited role in ORR, the resulting Co/Co9S8 is found to be indispensable to achieve high activity and durability in MFCs cathodes. The dominant ORR pathways of Co/Co9S8/NPGC (800 and 900 degrees C) are the four-electron O-2 reduction, which are attributed to the co-existence of pyridinic N, graphitic N and Co-N-x species. These new N-doped metal sulfide/PGC composites show promise for applications in MFCs. (C) 2015 Elsevier B.V. All rights reserved.